Lines and Angles

text book page: 130

what you will be doing in this section?
- identifying relationships between lines
- angles being formed by transversals

• parallel postulate: is a line & a point not on the line, then there is exactly one line through the point parallel to the given line.

one line goes through the line D parallel to I

• perpendicular postulate: If there is a line and a point not on the line, then there is exactly one line through the point perpendicular to the given line.

there is one line through point K
The line is perpendicular o point P

Identifying <'s formed by transversals

terms:
transversal- intersecting a system of lines.
corresponding angles- the angles that occupy the same relative position at each intersectionwhere a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal.
alternate exterior angles-The pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles.
alternate interior angles-The pairs of angles on opposite sides of the transversal but inside the two lines are called Alternate Interior Angles.